So currently I have a link below my images where the image loads directly and therefore it is possible to get it working as full screen on iOS devices, as its not possible to have a full screen function inside a frame.
Then I started thinking, when iOS device is used could it be possible to have the full screen button as a direct link to the whole image, just as I have a link now below. But of course keep the full screen button as is for desktop and Android devices that support full screen.
Example here.